A generic 2D engine for any kind of game
2D physics engine for games
TurboSphere is an easy to learn and powerful JS based game engine.
A 3D, fully concurrent game engine
C++ Text Adventure Engine
A Simple Game Engine
3D game engine for C and C++
Open source, moddable game engine for the "Polygon Love 2" game
Java Client + JS/Canvas Server-Side System, with maintained Objects
Javascript adventure game engine
cross-platform 2d game engine
Demonstrating the features of jMonkeyEngine 3.
Cross-platform 2D game engine
A cross platform 3d c++ game engine